Engine manufacturers must follow Machinery Directive 2006/42/EC with the design and manufacture when machinery is imported in the European internal market. The purpose of this thesis was to make one specific warehouse system meet the requirements of the Directive. We explored one security aspect, speeding of the shuttle inside the warehouse. Compliance with safety regulations is finally addressed by CE marking attached to the machine.

The basis were at risk analysis and requirements specification made for the warehouse system and the content of those documents was specified in this work. In the risk analysis it was found that shuttle moving inside the warehouse can cause its collapse when colliding to the end, which could result in possible personal injury. For this situation a safety function that stops the movement in the event of speeding was required.

Machinery Directive contains a number of standards that can be applied to the system depending of its type. In this work we chose B1-type standard SFS-EN ISO 13849 which defines the security through performance levels (PL). The standard was chosen because of its simple approach, and because it takes account the use of programmable electronics that implementation involved.

The performance level that was required for the safety function was set out as c on the basis of risk assessment defined in the standard. The hardware used in the safety function already existed so in this thesis we tried to identify what architecture described in the standard would fit our design. Architecture of class 3 was chosen from the standard and it contains two independent channels. Channels control the inputs and outputs and also perform monitoring as well as crosswatching of each other.

Software of safety function was designed and implemented for one channel in this work. It was also shown that the equipment used in the safety function achieves adequate risk reduction when the software has been completely taken into account for both channels.

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